"""Path constants and configuration for the personal knowledge base."""

import os
from pathlib import Path
from datetime import datetime, timezone
from zoneinfo import ZoneInfo, ZoneInfoNotFoundError

# ── Paths ──────────────────────────────────────────────────────────────
ROOT_DIR = Path(__file__).resolve().parent.parent
DAILY_DIR = ROOT_DIR / "daily"
KNOWLEDGE_DIR = ROOT_DIR / "knowledge"
CONCEPTS_DIR = KNOWLEDGE_DIR / "concepts"
CONNECTIONS_DIR = KNOWLEDGE_DIR / "connections"
QA_DIR = KNOWLEDGE_DIR / "qa"
REPORTS_DIR = ROOT_DIR / "reports"
SCRIPTS_DIR = ROOT_DIR / "scripts"
HOOKS_DIR = ROOT_DIR / "hooks"
AGENTS_FILE = ROOT_DIR / "AGENTS.md"

INDEX_FILE = KNOWLEDGE_DIR / "index.md"
LOG_FILE = KNOWLEDGE_DIR / "log.md"
STATE_FILE = SCRIPTS_DIR / "state.json"

# ── Timezone ───────────────────────────────────────────────────────────
# Configurable via the MEMORIA_TZ environment variable. Default is
# America/Indiana/Indianapolis (Eastern — covers Fort Wayne and most of
# central/eastern Indiana). Upstream defaulted to America/Chicago; we
# diverge to match our actual deployment. If the zone name is unknown
# (missing tzdata, typo), log a warning and fall back to the system local
# timezone via astimezone() with no argument.
TIMEZONE = os.environ.get("MEMORIA_TZ", "America/Indiana/Indianapolis")

try:
    TZ: ZoneInfo | None = ZoneInfo(TIMEZONE)
except ZoneInfoNotFoundError:
    import logging
    logging.getLogger(__name__).warning(
        "Timezone %r not found; falling back to system local time.", TIMEZONE
    )
    TZ = None


def _now_local() -> datetime:
    """Current datetime in the configured TIMEZONE (or system local as fallback)."""
    if TZ is not None:
        return datetime.now(TZ)
    return datetime.now(timezone.utc).astimezone()


def now_iso() -> str:
    """Current time in ISO 8601 format, in the configured TIMEZONE."""
    return _now_local().isoformat(timespec="seconds")


def today_iso() -> str:
    """Current date in ISO 8601 format, in the configured TIMEZONE."""
    return _now_local().strftime("%Y-%m-%d")